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Hydrothermal Synthesis and Characterization of the Thorium Phosphate Hydrogenphosphate, Thorium Hydroxide Phosphate, and Dithorium Oxide Phosphate

✍ Scribed by V. Brandel; N. Dacheux; M. Genet; R. Podor

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 432 KB
Volume: 159
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2001.9143

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✦ Synopsis

Because of its low solubility in water and high thermal stability, thorium phosphate diphosphate (TPD), Th 4 (PO 4 ) 4 P 2 O 7 , seems to be a very good matrix for radionuclide immobilization. During the leaching studies of this compound the formation of a new phase, di4erent from the TPD was observed. In order to identify this phase, two other thorium phosphates: thorium phos-phate+hydrogenphosphate (TPHP), Th 2 (PO 4 ) 2 HPO 4 ' H 2 O, and thorium hydroxide phosphate (THOP), Th(OH)PO 4 , were synthesized in hydrothermal conditions then characterized. It appeared that the neoformed phase was identical to the TPHP.

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